ixgbe: Fix 1G link WoL

We reset during the shutdown path which will reset AUTOC register.  This
would change LMS to 10G.  If we were currently linked at 1G we will lose
link, which is a bad thing if we wanted WoL to work.  For the fix I needed
to know if WoL is supported so I created a new bool in the ixgbe_hw struct.
If this is set we will not allow the reset to change the current LMS value
in AUTOC.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

3 files changed, 8 insertions, 2 deletions

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c
index b6289f11b764..7946da94b228 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c
@@ -1051,8 +1051,11 @@ mac_reset_top:
                 /* If MNG FW is running on a multi-speed device that
                  * doesn't autoneg with out driver support we need to
                  * leave LMS in the state it was before we MAC reset.
+                 * Likewise if we support WoL we don't want change the
+                 * LMS state either.
                  */
-                if (hw->phy.multispeed_fiber && hw->mng_fw_enabled)
+                if ((hw->phy.multispeed_fiber && hw->mng_fw_enabled) ||
+                    hw->wol_supported)
                         hw->mac.orig_autoc =
                                 (hw->mac.orig_autoc & ~IXGBE_AUTOC_LMS_MASK) |
                                 curr_lms;
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index ac6e464382e4..25c0e354f4ae 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -7526,7 +7526,9 @@ skip_sriov:
         /* WOL not supported for all devices */
         adapter->wol = 0;
         hw->eeprom.ops.read(hw, 0x2c, &adapter->eeprom_cap);
-        if (ixgbe_wol_supported(adapter, pdev->device, pdev->subsystem_device))
+        hw->wol_supported = ixgbe_wol_supported(adapter, pdev->device,
+                                                pdev->subsystem_device);
+        if (hw->wol_supported)
                 adapter->wol = IXGBE_WUFC_MAG;
 
         device_set_wakeup_enable(&adapter->pdev->dev, adapter->wol);
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
index 200b1a885ec5..155a793705be 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
@@ -2998,6 +2998,7 @@ struct ixgbe_hw {
         bool                            force_full_reset;
         bool                            allow_unsupported_sfp;
         bool                            mng_fw_enabled;
+        bool                            wol_supported;
 };
 
 struct ixgbe_info {